Initial commit

node_modules/mongoose/lib/helpers/projection/isExclusive.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const isDefiningProjection = require('./isDefiningProjection');
+
+/*!
+ * ignore
+ */
+
+module.exports = function isExclusive(projection) {
+  if (projection == null) {
+    return null;
+  }
+
+  const keys = Object.keys(projection);
+  let ki = keys.length;
+  let exclude = null;
+
+  if (ki === 1 && keys[0] === '_id') {
+    exclude = !!projection[keys[ki]];
+  } else {
+    while (ki--) {
+      // Does this projection explicitly define inclusion/exclusion?
+      // Explicitly avoid `$meta` and `$slice`
+      if (keys[ki] !== '_id' && isDefiningProjection(projection[keys[ki]])) {
+        exclude = !projection[keys[ki]];
+        break;
+      }
+    }
+  }
+
+  return exclude;
+};